Stronger abs without a single crunch? Sign us up.
By Kimberly Dawn NeumannMeet the sit-up's smarter sibling. Less than 10 minutes of planking a
few times a week flattens abdominals more effectively than a thousand
crunches can, says Geralyn Coopersmith, the global director of
performance and fitness training for Nike. It's also a test of muscle
control. Once you're in a plank, you shouldn't shift an inch. The plank is
the key to both a whittled middle and a pain-free back. That's because
"strong abs keep your spine supported," says Coopersmith. "Think of it
as midsection multitasking."
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